Wide pleasure boat or cruise ship

ABSTRACT

A cruise ship or pleasure boat is disclosed that has an open or semi-open main public space situated around the axial longitudinal plane of the ship and at the base of port and starboard longitudinal superstructures. The port and starboard longitudinal superstructures that border the public space are inclined away form the axial longitudinal plane of the ship so that the ratio of the width of the combination comprising the longitudinal superstructures and the public space to the width of the ship at the waterline is from 1.3 to 3.

This is a continuation of application Ser. No. 10/268,686 filed Oct. 11, 2002.

The entire disclosure of the prior application, application Ser. No. 10/262,686 is hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention concerns a wide pleasure boat or cruise ship of the kind having an open or semi-open main public space bordered by longitudinal superstructures.

In the present description and in the claims:

the expression “main public space” designates a space of substantial size comprising one or more areas dedicated primarily to the use of passengers;

the expression “open main public space” designates a main public space which is open to the outside, primarily at the top;

the expression “semi-open main public space” designates an open main public space to which one or more fixed or mobile elements have been added, primarily at the top, whose function is to keep out sun, wind and inclement weather;

the expressions “length” and “width” respectively designate the dimension in the longitudinal direction of the ship (normal direction of forward movement) and the dimension in the transverse direction of the ship;

the expression “set of superstructures” designates the portion of the ship situated above the mean level of the compartmentalization deck, which deck covers the watertight compartmentalization bulkheads;

the expression “longitudinal superstructure” designates a substantial portion of the set of superstructures whose length is greater than the width; and

the expression “classically proportioned quickwork” designates quickwork for which the ratio of the length at the waterline to the width at the waterline is from 4 to 10, as in most present-day ferries and pleasure boats.

2. Description of the Prior Art

Cruise ships and pleasure boats (large yachts) are usually single-hull vessels with decks whose width is identical or close to the width of the ship at the waterline. The open or semi-open public spaces are generally on the upper decks. To meet an ever increasing demand to increase the density of cabins and other areas giving onto the outside, some ship designs have a longitudinal main public space bordered by port and starboard vertical longitudinal superstructures primarily accommodating cabins with an outside view, either toward the sea if they are on the side away from the axis of the ship or toward the main public space in question if they are on the side near the axis of the ship. These ship designs have a total width equal to or close to their width at the waterline. If the ship is a single-hull vessel, its substantially U-shaped cross section cannot provide a volume of air above the main public space wide enough for the public space and the cabins and other areas giving onto it to be user-friendly, pleasant and sufficiently sunny. Widening the entire ship is not advantageous, in particular because of uncomfortable rolling (the natural period of rolling of the ship would become too short); this problem can be solved by producing a multiple-hull ship, which has other drawbacks such as the high cost of building the underwater portions.

The present invention aims to avoid the above problems by using a new design principle which provides many outdoor spaces or spaces giving onto the outdoors that are user-friendly and functional but satisfy comfort and safety requirements.

SUMMARY OF THE INVENTION

In a ship according to the present invention, of the kind having an open or semi-open main public space situated around the axial longitudinal plane of the ship and at the base of port and starboard longitudinal superstructures, the port and starboard longitudinal superstructures that border the public space are inclined away from the axial longitudinal plane of the ship so that the width of the combination comprising the longitudinal superstructures and the public space is significantly greater than the width of the ship at the waterline, the ratio of the width of the combination comprising the longitudinal superstructures and the public space to the width of the ship at the waterline being from 1.3 to 3, and preferably from 1.6 to 2.5. This increases the transverse inertia of the ship, which makes it roll more slowly and makes its rolling characteristics less sensitive to short-period swell. Moreover, the volume above the public space is made larger, the public space becomes more user-friendly and functional, and the areas situated in the longitudinal superstructures and giving onto the public space become more pleasant. Moving the two superstructures farther apart reduces the risk of a fire propagating from one superstructure to the other. The ship is advantageously of the single-hull type. The quickwork of the ship is classically proportioned, meeting comfort, stability and drag requirements. The dimensions and mass of the longitudinal superstructures are similar to facilitate transverse balancing of the ship, but the longitudinal superstructures need not be exactly symmetrical. The expression “widened assembly” refers to the assembly comprising the public space and the port and starboard longitudinal superstructures that border it. The ship can have one or more widened assemblies.

In the area of the widened assembly, the resistance to longitudinal flexing of the ship beam can be provided either by the combination of the hull and the superstructures or only by the portion of the ship to which the longitudinal superstructures are attached, the latter being decoupled longitudinally by sliding joints. The transverse resistance of the ship to rolling (known as the “racking” resistance) can be provided by a large number of transverse structural bulkheads in the hull and in the longitudinal superstructures, and transverse horizontal beams can be connected from the top of one longitudinal superstructure to the other.

It is advantageous to dedicate the port and starboard structures that border the public space primarily to passenger cabins, so that all cabins give onto the outside, some cabins having the benefit of a sea view and others having the benefit of a view onto the public space. Passenger cabins are also arranged along the inclined inboard facade of the port and starboard superstructures such that a distance between the axial longitudinal plane of the ship and the inboard walls of the cabins is greater at the top of the superstructure than at the base of the superstructure. The horizontal circulation of the air conditioning trunking can be grouped together at a single level, the cabins situated in these superstructures on a different deck being fed with conditioned air from this level by vertical trunking in groups of two to four. This simplifies the design, construction and erection of these areas. In particular, it is practical to fabricate prefabricated cabin elements into which vertical air conditioning trunking is integrated (and even water pipes, electrical cables, etc.).

The ship according to the invention can have an approximately V-shaped or Y-shaped cross section, the port and starboard longitudinal superstructures having a transverse overall inclination. This overall inclination imparts to the public space at the base of the longitudinal superstructures a sunny aspect and creates an impression of terraces.

In a first embodiment, the hull of the ship according to the invention flares rapidly above the waterline, with a mean angle to the vertical of at least 25°, the longitudinal superstructures that border the main public space being situated close to each side of the flared hull. In the event of invasion by water, the overall shape of the ship increases the width at the waterline as the ship settles, and thus significantly improves the stability of the ship, which depends directly on the transverse inertia at the waterline.

In a second embodiment, the width of the hull of the ship according to the invention does not increase much or at all above the flotation line, the mean angle between the edge of the hull and the vertical being less than 25°, the longitudinal superstructures that border the public space being situated close to the side on a superstructure situated on the hull, at least 2.5 meters high and significantly wider than the ship at the flotation line. This configuration enables the ship to be designed with a relatively simple longitudinal structure.

In the ship according to the invention, at least the aft two thirds of all of the superstructures consist of one or more public spaces bordered by longitudinal superstructures, the forward part consisting of an enclosed area extending over the whole of the width. This area can be dedicated primarily to public spaces, cruise spaces and the wheelhouse. The center of gravity of the ship is thus positioned significantly further forward than in a conventional cruise ship or pleasure boat. Making the quickwork more bulky in the forward third, but not wider, balances the trim of the ship, without moving forward the center of inertia at the waterline. The longitudinal offsetting of the center of gravity relative to the center of inertia at the waterline is a factor improving the pitching behavior of the ship with some kinds of swell.

The accompanying drawings illustrate the invention:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows in cross section a design principle of a ship according to the invention.

FIG. 2 shows a variant of the above principle in more detailed cross section.

FIG. 3 shows another variant of the principle in cross section.

FIGS. 4, 5, 6 and 7 each represent a rear perspective view of a non-limiting example of a ship according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to the drawings, the ship has a main structure 1 whose portion below the waterline 2 constitutes the quickwork. An open or semi-open main public space 4 is situated on the main structure 1. The ship has port and starboard longitudinal superstructures 3 which border the public space and which are far away from the axial longitudinal plane of the ship so that the ratio of the width 5 of the combination comprising the longitudinal superstructures 3 and the public space to the width 6 of the ship at the waterline is from 1.3 to 3 and preferably from 1.6 to 2.5. For increased sunshine, the inboard facade of the superstructures can have a mean rake angle 7 from 3° to 50° and preferably from 5° to 35°.

Referring to FIG. 2, the ship can have a hull whose width 10 does not increase much or at all above the waterline, the mean angle between the edge of the hull and the vertical being less than 25°, the longitudinal superstructures 3 that border the public space being situated close to the side on a superstructure 9 situated on the hull, at least 2.5 meters high and significantly wider than the width 6 of the ship at the waterline.

Referring to FIG. 3, the hull of the ship can flare rapidly above the waterline, with a mean angle 11 relative to the vertical of at least 25°; the port and starboard longitudinal structures 3 can have a transverse overall inclination which makes the lower main public space 4 sunnier and substantially increases the width of the widened assembly above the waterline 5. The longitudinal superstructures 3 can be primarily dedicated to passenger cabins 12 giving onto the outside. Passenger cabins are also arranged along the inclined inboard facade of the port and starboard superstructures such that a distance between the axial longitudinal plane of the ship and the inboard walls of the cabins is greater at the top of the superstructure than at the base of the superstructure. In the case of this ship concept, the horizontal circulation of the air conditioning trunking 13 can be grouped together at a single level, the cabins situated in these superstructures on a different deck being fed with conditioned air from this level by vertical trunking 14 in groups of two to four.

FIG. 4 shows a ship according to the invention which has a widened assembly, a marina at the stern, an full-width enclosed forward area, and a panoramic saloon above the marina.

FIG. 5 shows a ship according to the invention which has two widened assemblies separated from each other by an enclosed transverse superstructure. The aft widened assembly is protected from sun and wind by a stretched canvas awning. The 

1-10. (canceled)
 11. A ship comprising an open or semi-open main public space situated around an axial longitudinal plane of said ship and at a base of each port and starboard longitudinal superstructures, wherein said port and starboard longitudinal superstructures bordering said public space are disposed away from said axial longitudinal plane of said ship, and wherein said ship's hull flares rapidly above its waterline with a mean angle relative to the vertical of at least 25°.
 12. The ship claimed in claim 11, wherein a ratio of a width of a combination comprising said longitudinal superstructures and said public space to a width of said ship at the waterline is from 1.3 to
 3. 